Resume of kinetics

From a practical point of view, the rate of a chemical reaction is the slope of the tangent to the curve showing the change of concentration of a species with time. Clearly, the rate at which either a reactant is consumed or a product is formed changes during the course of the reaction. Thus, one needs to consider the instantaneous rate of the reaction as the rate at a given instant. 

The chemist needs to characterize a chemical reaction with only one rate, regardless of whether considering the consumption of areactant or the formation of a product. To this end we consider the following chemical reaction 

Laser Chemistry Spectroscopy, Dynamics and Applications Helmut H. Telle, Angel Gonzalez Urena Robert J. Donovan 2007 John Wil Sons, Ltd ISBN 978-0-471-48570-4 (HB) ISBN 978-0-471-48571-1 (PB) 

CH20 BASIC CONCEPTS OF KINEHCS AND REACnON DYNAMICS 

The coefficient k, which characterizes the reaction under study, is called the rate constant. It is a function of temperature, but it is also independent of the concentrations. The numbers a, b and c are defined as partial orders of A, B and C respectively. The overall order of areaction n is the sum of the partial orders, i.e. 

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